When you select a particular window to record with the screen + cam mode, we record only the window and not the entire screen. For this reason, the camera with your face is not in the final recording.

The way to solve this is to select to record the Screen instead of Window

The problem of the camera bubble not showing in the final recording, should only happen if you have select to record the entire screen, launch the recording on one browser window and then go to another browser window.

If you record using the extension from the same browser window you wish to record, you should see the camera with your face in the final recording.